Attorney General Eric Holder is calling for major changes to the nation’s criminal justice system that would scale back the use of harsh prison sentences for certain drug-related crimes, divert people convicted of low-level offenses to drug treatment and community service programs and expand a prison program to allow for release of some elderly, non-violent offenders. In remarks prepared for delivery Monday to the American Bar Association in San Francisco, Holder said he is mandating a change to Justice Department policy so that low-level, non-violent drug offenders with no ties to large-scale organizations, gangs or cartels won’t be charged with...